Delegates.observable追踪观察可变数据更新,Kotlin
import kotlin.properties.Delegates
import kotlin.reflect.KProperty
class Person {
var name: String by Delegates.observable("fly") { prop: KProperty<*>, old: String, new: String ->
println("$old -> $new")
}
}
fun main() {
val p = Person()
p.name = "phil"
}
fly -> phil
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